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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年03期

页码:

70-82

栏目:

建筑结构

出版日期:

2023-05-20

文章信息/Info

Title:

Axial compression test and bearing capacity calculation of square columns composite strengthened with alkali-resistant fiberglass grid and polypropylene concrete

文章编号:

1673-2049(2023)03-0070-13

作者:

黄海林^1,2,高亚强¹,徐勇逵¹,陈思程¹,庄达炜³

(1. 湖南科技大学 土木工程学院,湖南 湘潭 411201; 2. 湖南科技大学 湖南省智慧建造装配式被动房工程技术研究中心,湖南 湘潭411201; 3. 湖南湘广泰实业集团有限公司,湖南 长沙 410000)

Author(s):

HUANG Hailin^1,2, GAO Yaqiang¹, XU Yongkui¹, CHEN Sicheng¹, ZHUANG Dawei³

(1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China; 2. Hunan Engineering Research Center for Intelligently Prefabricated Passive House, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China; 3. Hunan Xiangguangtai Industrial Group Co., Ltd, Changsha 410000, Hunan, China)

关键词:

耐碱玻纤网格;  聚丙烯混凝土;  方柱;  轴压试验;  破坏机理;  承载力计算

Keywords:

alkali-resistant fiberglass grid;  polypropylene concrete;  square column;  axial compression test;  failure mechanism;  bearing capacity calculation

分类号:

TU746.3

DOI:

10.19815/j.jace.2021.10025

文献标志码:

A

摘要:

通过16个基于耐碱玻纤网格与聚丙烯混凝土复合加固方柱的轴压性能试验,得到了各试件的极限承载力与破坏形态,测得了各试件混凝土中部纵向压应力-应变曲线、试件压应力-耐碱玻纤网格中部应变曲线,分析了加固层混凝土中聚丙烯纤维含量、耐碱玻纤网格包裹方式等参数对试件轴压性能及破坏机理的影响。通过引入合理的基本假定和强度模型,提出了耐碱玻纤网格与聚丙烯混凝土复合加固方柱的轴压承载力计算方法,并将所提计算方法及相关文献计算方法得到的理论计算值与试验结果进行了比较。结果表明:试件主要破坏形态为纵向压劈破坏,裂缝最先出现在试件角部区域并向两端发展,部分试件出现加固层剥离现象; 相较于耐碱玻纤网格间隔包裹试件,全包试件表现出更好的抗压性能及延性; 随着加固层混凝土中聚丙烯纤维含量的增加,试件极限承载力呈先提高后降低的趋势; 采用所提计算方法得到的理论计算值与试验结果吻合较好,且理论计算值均小于试验值,说明所提公式具有一定安全储备,可供工程设计参考使用。

Abstract:

Through 16 square columns composite strengthened with alkali-resistant fiberglass grid and polypropylene concrete axial compression tests, the ultimate bearing capacity and failure modes of each specimen were obtained. The longitudinal compressive stress-strain curve in the middle of the concrete and the compressive stress-strain curve in the middle of the alkali-resistant fiberglass grid were measured. The influences of polypropylene fiber content in the reinforced layer concrete, alkali-resistant fiberglass grid wrapping mode and other parameters on the axial compression performance and failure mechanism of the specimen were analyzed. By introducing reasonable basic assumptions and strength models, the calculation method of axial compression bearing capacity of square columns strengthened with alkali-resistant fiberglass grid and polypropylene concrete was proposed. The theoretical calculation value obtained by the proposed calculation method and the calculation method in relevant literature was compared with the test results. The results show that the main failure mode of the specimen is longitudinal compression fracture. The cracks first appear in the corner area of the specimen and develop towards both ends. Some specimens have peeling phenomenon of the reinforcement layer. Compared with the alkali-resistant fiberglass grid interval wrapped test specimen, the fully wrapped test specimen shows better compression performance and ductility. With the increase of the content of polypropylene fiber in the reinforced concrete, the ultimate bearing capacity of the specimen first increases and then decreases. The theoretical calculation value obtained by the proposed calculation method is in good agreement with the test result, and the theoretical calculation value is less than the test value, indicating that the proposed formula has a certain safety reserve and can be used for reference in engineering design.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-10-09
基金项目:国家自然科学基金项目(51308207); 湖南省教育厅优秀青年项目(19B188); 湖南建工集团基础研究项目(JGJTK-2018003)
作者简介:黄海林(1984-),男,工学博士,副教授,E-mail:hhlvsgenius@163.com。
通信作者:高亚强(1996-),男,工学硕士研究生,E-mail:327548357@qq.com。

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更新日期/Last Update: 2023-05-20